Integrate gitlab-ci/share-build-and-test-job-basics

Commit: seco-ne/yocto/infrastructure/gitlab-ci@075aeccb

Refactoring: share build and test job basics for ci-test and Yocto

This shares YAML code for the following procedures:

• Build environment
• Source code checkout via repo
• SSH key and known hosts setup
• LAVA test submission
• Docker check if build folder is empty

Source merge request: seco-ne/yocto/infrastructure/gitlab-ci!182 (merged)

mentioned in merge request seco-ne/yocto/infrastructure/gitlab-ci!182 (merged)

merged